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1 in front of the air inlet, containing anion material, on both sides of the outlet, in and out of the port to form a channel, breathe more smoothly。
2 masks, change traditional hanging ear type adopts cross paste method, effectively solve the ear problems caused by wearing a mask for a long time.
3 masks with airtight except in and out of the port the rest material, to prevent the harmful gas.
4 rear joint with breathable materials, user even sweating will not feel uncomfortable.
Xi'an University of Technology